diff --git a/Text/Regex/PCRE/Light/Base.hsc b/Text/Regex/PCRE/Light/Base.hsc
--- a/Text/Regex/PCRE/Light/Base.hsc
+++ b/Text/Regex/PCRE/Light/Base.hsc
@@ -113,7 +113,8 @@
 -- The structure allocated by the PCRE library will be deallocated
 -- automatically by the Haskell storage manager.
 --
-data Regex = Regex !(ForeignPtr PCRE) !S.ByteString
+data Regex = Regex {-# UNPACK #-} !(ForeignPtr PCRE)
+                   {-# UNPACK #-} !S.ByteString
         deriving (Eq, Ord, Show)
 
 type PCRE = ()
diff --git a/pcre-light.cabal b/pcre-light.cabal
--- a/pcre-light.cabal
+++ b/pcre-light.cabal
@@ -1,5 +1,5 @@
 name:            pcre-light
-version:         0.3.1
+version:         0.3.1.1
 homepage:        http://code.haskell.org/~dons/code/pcre-light
 synopsis:        A small, efficient and portable regex library for Perl 5 compatible regular expressions
 description:
@@ -14,12 +14,12 @@
 category:        Text
 license:         BSD3
 license-file:    LICENSE
-copyright:       (c) 2007. Don Stewart <dons@galois.com>
+copyright:       (c) 2007-2010. Don Stewart <dons@galois.com>
 author:          Don Stewart
 maintainer:      Don Stewart <dons@galois.com>
 cabal-version: >= 1.2.0
 build-type:      Configure
-tested-with:     GHC ==6.8.2, GHC ==6.6.1, Hugs ==2005
+tested-with:     GHC ==6.8.2, GHC ==6.6.1, GHC ==6.12.1, Hugs ==2005
 extra-source-files: configure, pcre-light.buildinfo.in
 extra-tmp-files:    pcre-light.buildinfo
 
@@ -33,10 +33,9 @@
                      Text.Regex.PCRE.Light.Base
 
     extensions:      CPP, ForeignFunctionInterface
-    ghc-options:     -Wall -O2 -fvia-C
 
     if flag(small_base)
-        build-depends: base >= 3, bytestring >= 0.9
+        build-depends: base >= 3 && <= 5, bytestring >= 0.9
     else
         build-depends: base < 3